Impulse-transmitting device



t. 0 Sep 6 1927 J. G. BLEsslNG IMPULSE TRANSMITTING DEVICE Filed June 7. 1924 4 Sheets-Sheet l mimi l l s fr. v5.5.2:

.Inu-Bn nr Jul-m .EB 1E s am 2%? Sept 6 1927 J. G. BLEssiNG IMPULSE TRANSMITTING DEVICE Filed June 7. 1924 4 Sheets-Sheet 2 to g Sep 6 w27 J. G. BLEsslNG IMPULSE TRANSMITTING DEVICE Filed June '7 1924 4 sheets-sheep 3 ETT-f Sept' 6 1927 J. G. BLl-:ssNG

IMPULSE TRANSMITTING DEVICE Filed June v. 1924 4 sheets-sheet 4 K M M Patented Sept. 6, 1927.

narran srares 1.641.616! @par ur o ries.

` JOB-2N G. BLESSING, OF CHICAGO, ILLINOIS, ASSIGNOR; BY MESNE ASSIGNMENTS, T0

AUTOMATIC ELECTRIC INC., 0F CHICAGO, ILLINOIS, A CORPOMTION 0F Dmwaan. A v

f mrULsE-rmsmmrme navran- 'Applcation filed June 7,

party to call 4the required party instead of v having to elect a number of se`.ective actions.

Attempts have heretofore been made to devise and construct a calling device accomplishing this result, but the nearest approach, so far as applicant is aware, is the impulse transmitting device disclosed in Patent No.

1,306,829, issued to E. A. Mellinger J une 17, 1919, in which a setting up operation fol.- lowed by a single selective operation is required.

The invention will be more readily understood from the following description taken in connection with the accompanying drawings forming a part of this specification.

Referring now to the drawings, Fig. 1 shows a side elevation of the calling device with certain parts cut away.'

Fig. 2 is a front view of dial and the finger stops. y

Fig. 3 is a .diagrammatic view of the mechanism of the device. l

Fig. 4 'shows ciricuit connections between the device and substation apparatus provided with the usual calling device.

Fig. 5 is a crosssectioned fragmentary view of certain parts.

Fig. 6 is a top view of the movable dnger stop 11.

Fig. 7 isa sectional view of Fig. 3 taken the finger hole from dotted line C-C as seen when looking in the direction indicated by the arrows Fig. 8 is a sectional view of Fig. 3 taken- 1924. serial no. lMateo.

in the device and not diagrammatically as shown in Fig. 3. i

9 is a bottom view of Fi 7. v

Figs; 10, 11, 12, 13 and 14 s ow various details. l Y l Referring now to' Figs. 1, 3, 7 and 8, a tubular member 2 provided with a flange 4 1s fixed to a base 1 by means of screws 3. These parts form. the housing for the ,mechaf nism about to be described. In order to provide a `framework for the mechanism two mountlng plates 7 and 8 are' provided which are connected together by three spacing membersor posts 5. Une of these posts is shown complete inFig. 1, whileall three posts and their particular location is clearly shown in 7 and 8. Each'of these posts has a cut away portion provided with a round head machine screw 6 (see Figs.' 1 and 7). When the mechanism is properly placed in the tubular housing 2 the screws G-corne into vz lliggmment with holes 9 'in the tubular housing 2. These holes are slightly .smaller than the largest part of the head of screws- 6 and, as is evident in Fig. 1. when these screws are screwed outward they register with the holes 9 and in so doing lock the framework for the mchanism in place.

Heretofore' in calling-.devices of the dial type the usual purpose of the dial has been ,to provide means fon-winding upa spring, which uponrelease of .the dial, was rendered edective to operate an'impulse cam a number fof revolutions depending upon the degrees of forward rotation of 'the dial. v

ln the present case, however, the means for driving the impulse cam is in no way indll' fluenced by the finger hole dial, but instead i The nger hole dial in the present case serves as a subscribers number selecting device in that its degrees 'of rotation determines which operations of the impulse cam will be rendered inedective.

Referring now 'to ligs. 3 and 5, the arrangement o the movable Enger stops and the chain ot gears connectin them withthe impulse cam will be describe Referring paricularly to Fig. 5 it will be noted that the bar 56, its ends'torming the linger stops 11 and 11', has fixed to itslower side a gear 13. This gear .is in the form of a cup in which is mounted a power Spring 54, the outer end of which 1s xed to the gear 13. An upward extending portion of plate 8 is provided with a lug 55 to which th'e inner end of springv 54 is fastened. A downwardly extending hub 1 07 fixed on the member 56 extends through plate 8, and serves as a shaft for member 56.

Gear 13 is permanently in mesh wlth the gear 14 of a gear unit comprising gears 14, 17,- and ratchet disk 32. T is unit is rotatf ably' mounted on a downwardly extendmg shaft staked to bridge plate 16 as shown 1n Fig. 5. Gear 17 is permanently in mesh with a pinion 18, and a pawl and ratchet arrange- .ment is provided, shown in Figs. 11 and 13,

between pinion 18 and gear 19. Gear'wheel 19 is in permanent mesh with a pinlon 20 which is pernzanently fixed to shaft 58. Also fixed to this shaft is the impulse cam 39 and the worml wheel 63. The worm wheel is in permanent mesh with the governor assembly 21 which, as clearly shown in Fig. 8, is fixed to the plate 8 by means of 'a bracket 101,

and screw 99 carried by a threaded member 100, which is staked to the p1ate8. A hub having an arm 40 which is also fixed to the shaft 58'is rovided for a purpose which will ter described. Before the .gear 13 is placed down far enough to mesh with gear 14, and after the spring 54 is fixed 1n place, member-56 is rotated two or more revolutions in order to store a proper amount of'tensionin spring 54. A projection 108 on the bridge p ate 16 is in the path of projections 43 `an 43 l dpreventing the unwindlng of s ring 54 an limitingthe movement of mem er 56 in either direction to slightlyl less than one-half revolution, pin 43 engaging pin 108 in one 'case and pin 43 enga ing pin 108 in the other case.

e gear ratio between gears 13 and 14 is such that when ythe bar 56 is rotated as far as it will go, gears 14 and 17 and ratchet disk 32- will be rotated slightly more than one complete revolution. y

Referring now to Figs. 3 and 12, shaft 74 has fixed to it the L-sha ed arm 75, the auxiliary disk 31, and a c e disk assembly comprislng a bank of twenty disks 30. Auxiliary disk 31 carries a pawl 33 and a tooth 62. Pawl 33 normall engages the tooth of ratchet disk 32, whi e a spring retaining pawl 37 mounted on.' plate 8 normally engages tooth 62. The twenty disks -30 (see Figs. 3,'4 and 12) are spaced an equal distance apart on shaft 74 by spacing members 45 and held in place by the nut 29. The rotation of an dlsk 30, independent .of shaft 74 is ositive y prevented. by the key or arm 75. s will be noted from observation of Fig. 3, the upper end of shaft 74 is considerably larger in diameter than its lower end and is drilled out to receive a bushing 106, as shown in Fi .7, and has for its axis the lower portion oshaft 105. Shaft 74 is pivoted an'd'insulated at its lower end from plate 7 lin the manner shown in Fig. 10, wherein a bushing is placed in an appropriate hole in plate 7 and the terminal 672 is lheld in place adjacent this bushing b means of machine'screw 52.. A washer 6g of insulating material is then placed on the screw 52and the nut 68 is screwed in place.

During a forward rotation of members 56 through the medium of one of its finger stops gear 13 rotates gear unit comprising gears 14, 17 and ratchet disk 32 one complete revolution. Due to the ratchet connec. tion between this unit, and the gears driving the impulse cam and governor, these latter mechanisms are not operated. The tension in spring 54 is, however, increased and when the finger stop is released the impulse cam is rotated a definite number of revolutions at'a speed determined by the governor assembly.

Also due to the ratchet connection'between the gear unit lcomprising gears 14, 17 and ratchet disk 32 and the code disk assembly, this assembly is not rotated during the setting movement of the finger stops, but rotates a complete revolution with the above gear unit when the finger stops are released. One of these disks is effective to operate springs for rendering certain operations of the impulse cam ineffective as will' be subsequently explained.

' As previously mentioned the dial serves tov determine, by its degrees of rotation the number of operations of the impulse cam which are to be eliective.L As will be apparent from Figs. 3 and 5 the dial 12 is fixed to a shaft 22 which has also fixed to it av ratchet wheel 26. The dial is provided with a downwardl extending pin 15, and a spring 23 wound a out the shaft 22 and having one end resting against a pin 42 .fixed to plate 8 and the other end resting against a pin 35 on the hub of ratchet 26. This spring normally holds the pin 15 of dial 12in the U-sha ed part ,of finger stop 11', Isee Fig. 6. A racket 88 carrying a shaft 89 is fixed to late 7, as shown in Fig. 7. On this shaft 1s rotatably mounted a hub 90 carryingarms 25 and 97', which are soldered or welded together in any'well known manner. A spring 38 links the arm 97 of the assembly to a. member 53 fixed to the plate 7 and serves. under normal conditions, to maintain arm 25 in the position shown. A wall having the form of an inclined plane extends slightly less than half way around the ratchet wheel 26and a roller 34 on arm 25, clearly shown in Fig. 7, is engaged by the lowestpoint of the'incline when' the dial and the ratchet wheel have been rotated inerme slightly less than onev halt revolution. lt will. be evident that by rotating the dial and the ratchet various distances, beyond one half revolution, the roller 84 will be raised by the incline and, as a. result, arm

25 and bracket assembly fill, carrying springs 80, 6l, 60 and 59' of the device', elevatesthese springs into operative relation with a disk ot the code disk assembly, the dislr selectedbep ing determined by the distance of the rotation ot the dial. Y

A shaft 97 is provided which has fixed to it at its upper end a cam-like arm 50. and on the otherend ot this shaft is keyed a hub provided with a member i6 and a pawl 47?. As clearly shown in Fig. 9 a lspring 77 havingr its ends connected to plate 7 and pawl member 47,'respectivtly, tends to ro'- tate pavvl t7 into engagement with teeth of ratchet wheel 26, and member i6 away `from the path ot rotation of the previously mentioned arm 4() on shaft 58. A pin 5l (see Fig. 3) on gear i3, however, normally engages arm 50 of shait 97, and as the normal tension of .the power spring 5e is much greater than that ot springr 77, pawl 47 is normally held disengaged from the teeth of Sli ` vided with three pairs .ot terminals (see A yScrew 126 is drilled out andl threaded to receive screw 12.9,this screw actingY lin the,

Fig. 9), consisting oi solder terminal 78, screw terminal 78', solder terminal 77, screw terminal 77, solder terminal 79, and screvv terminal 79', respectively.. These solder terminals are'tor making connections to various springs on the calling device, while the screvv terminals are Jfor connecting with conductors extending to substation ap aratus.

n impulse spring and terminal assembly is also mounted `oniplate 7. lThis impulse spring and terminal assembly (see Figs. 7, 9 and lll) consists ot a block ot insulating material 125 fixed togplate 7 by means of screws. This insulation carries the impulse spring and terminal assembly the particular construction and arrangement of which may be seen in Fig.' le. Referring to Fig. it, the insulation 125 and spring 66 are each provided with @shaped holes.d A. machine screw is provided with an enlarged D-shaped key,or portion adjacent its head. By means of this screw and its' Washer 127 and nut 128 spring" 66 is firmly: locked in place.

capacity of a terminal and enabling connection to be 'made with the spring Without soldering. rlhis arrangement is desirahle as i it enables a repairman to substitute new.

springs without the use of any toolsl other than al screwdriver. Spring 67, of course,

is mounted in the same manner.

Beter-ring now particularly to Figs. 2, 3

and 5, as previously described, the ratchet Wheel 26 and finger hole dial l2 are lined to a common shalt 23. From this it Vwill be apparent that regardless ot the degrees of rotation of dial 12 a like rotation of ratchet Wheel 26 Will take place. With this fact in mind particular attention is called to the arrangement of' the iinger holes on dial 12. As Will be apparent, when the dial is operated from any nger holelocated on the right of bar 56, stops 1l and 1l', the lnger stop l1 Will be used, but when the dial is operated from any Enger hole at the lett of har 56 stop 1]. will be used. Novv'it should be noted that the first hole of the series at the right ot stops l1 and 1l (the hole opposite the name Obergtell) is only a short distance from stop 1l', a distance equal to an angular displacement of the dial of 8 degrecs. As previously stated, linger. stops 1l and 11 are operable slightly' less than onehalt revolution, 156 degrees. The rst hole (opposite the name Martin) at the left of stops 11 and 11 is twice the distance away from' stop 11 vas is the hole (opposite the name bergfell) nearest the stop ll. The axis of-each hole ot a. series on either side ot stops ll and 1l are 16 degrees apart.

Novi considering rst the setting up operation ot the device from the nger hole opposite the name Obergtell. The operator places a. nger. in this hole and operates the dialin a clockwise direction as tar as it will go. When the dial has been rotated 6 .degrees the nger engages finger stop ll and since the sto can only be rotated 156 decrees the dial is rotated a total distance ot 16d degrees.v As soon as the dial hasbcen rotated 156 degrees the lovvest point ot the inclined track or vvall on ratchet wheel 26 (see Figs. Sand 7) engages roller 37 oit arm 25, but does not elevate it. The pitch or the incline on ratchet Wheel 26' is such that the dial and ratchet wheel on rotating the `next 8 'degrees causes .the incline on the ratchet wheel' to move the roller 3d and arm 25 vertically one step ora sumcient distance to positionthe springs 60, 6l and 80, carried bv bracket all, into operat'vc relation with the lovvermost disk 30. This elevation ot arm 25 from its normal position is equal to the distance between each of the Vdislrs 30 vWh'ch are eciual distances apart from Veach other. lt will, therefore, be seen that 8 de grecs otrotation will be required for elevating.V the springs from one disk to the next. i

lf the dial had been rotated from the finger hole opposte the name Lawson the dial would have been rotated the 16d degrees gli) ico

lllfo and 80 will be elevated into operative-relation with the third disk (counting the bottom disk as the first). If the dial had been o erated from the hole opposite'the name arris it would have been operated 156o plus 8 'plus (9 X 16") or a total of 300 degrees.` Now subtracting the first 156, these degrees being ineffective to elevate arm- 25 leaves a remainder of 152 degrees each of which would be effective to lift4 the arm 25. Since 8 degrees are required to lift the springs 60, 61, and 80 fromv one disk to the next the said springs would in this case have been lifted into operative relation with the nineteenth disk or level. This may be determined by dividing the effective degrees, 152, b 8.

yIt will be recalled that the finger hole opposite the name Martin was 16 degrees away from`finger stop 11'.' If the dial is operated from this finger hole itl will be evident that 16 degrees of the rotation of 'the' dial will be effectivel'and -as a result springs .60, 61, and 80 willbe positioned opposite the Second level or disk 30. Now if the dialha-d been operated from the finger' hole opposite' the name Matousek the effective rotation of the dial would e ual to 16o plus 9 X 16) or a total of 160 egrees, causing t e springs 60, 61 an'd 80 to be moved into operativeA relation with thetwentieth level or disk 30. From the above ,it will be evident that by the manipulation of the'dial from a particular finger hole a particular level or disk will be automatically selected.

Having described the mechanical structure of the calling' device and the relationship betweenthe two finger stops and the finger As soon as the finger has rotated the dial a holes, a descriptionv of its operation will now'be iven, reference being had particularly to igs. 2, 3 and 5. It will be assumed that the subscriber designatedA as Obergfell (see Fig. 2) is desired. The subscriber after l l removlng hls recelver places a finger 1n the hole opposite' the name of the subscriber desired and rotates `the finger holedial in a clockwise direction as far as it will go.

short -distance the finger engages. sto 11 and carries this finger stop with it. vVghen the finger stop has been rotated 156 degrees pin 43 engages fixed pin 108 and therefore cannot be rotated any further. As soon as the finger stop is mved from its normal position pin 51 disengages itself fromarm 50. This permits shaft 97 \to rotate'under tension of spring 77 (see Fig. 9) until arm 46 moves out of range of arm 40, and arm 47 engages the ratchet teeth of ratchet wheel .26. The movement of arm 47 into engagement with teeth of ratchet wheel 26 does not preventthis Wheel from being rotated in a clockwise direction, but instead locks it from rotation in the oppositel direction.l ln the manner previously described springs 60, 61, and are elevated into operative relation with the lowermost 'disk 30. Also, during the clockwise movement, gear 13, being fixed to bar 56, is rotated sufficient to rotate gear 14 a complete revolution. Due to ratchet disk 32 and pawl 33 the shaft 74, however, -is Vnot rotated. As previously pointed .out ratchet tooth 62 and pawl 37 are provided to guard against any possible backward rotation of the shaft 74. Also, due to ratchet wheel l72 andpawl 73 (see Fig. 11), shaft 58 is not rotated.

Now, when the fingerv is removed from the finger hole dial, ybar 56 in common with stops 11 and 11 returns to normal under tension of spring 54, and shaft 74 and the governor driving gear 19 are-now. rotated the governor acting to regulate the speed of the mechanism in the usual manner. Since pinion 20 is xed on shaft 58 this shaft falso rotates causing cam 39 to open impulse springs 66 and 67 a plurality of times. As soon as pin 51, on bar 56, again engages arm 50 shaft 97 is again rotated back to normal, arm 47 disenga'ging from gear 26 and arm .46 again moving into the path of rotating arm 40. Arm 47 permits the finger hole dial 12 to restore *to normal under tension of spring 22, while arm 46 prevents any overrun of the cam 39. The return to normal of the ratchet wheel 26 permits arm 25 and bracket 44 to restore to normal by tension stored up in spring 38 during the elevation of arm 25.

The normal osition of dial 12 is deterdownward from the underside. of the dial.

This pin engages the U-shaped portion of sto 11 (Fig. 6).

e 4impulse springs 66 and 67 are oper- .ated 120 times by the cam 39, but due to circuits which will now be described, certain operations of springs 66 and 67 are rendered station transmitter and receiver are short circuited, this short circuit extending by way of disk 30, brush 59, spring 60, springs of calling device C. D., transmitter T, receiver 'R and back to cam 30. At the same time the transmitter and receiver' are short circuited spring 61 1s engaged or lifted by cam 113 Inf) mined by a leater covered pin 15 extending surface of cam30 engages brush 59 the sube position itself in its normal position.

Learners of disk 30 removing the short circuit from around springs 66 and 67 for suiicienttime to render one operation of cam 39 eective, after which the springs 66 and 67 are again short circuited for va suiiicient time to allow the switch under control of the first series of impulses to complete its maximum trunk hunting movement, after which cam 114: opens the short circuit from around the impulse springs. Cam 114 maintains the short circuit removed for a period sui'icient to render ve operations of the impulse springs edective after 'which they are again short circuited by springs 60 and 61. As soon as cam 115 engages spring 61 the short circuit arounf'd the impulse springs is again removed, this time for a suflicient time to render effective eight operations of the impulse springs. From this it will be evident. that the number of the called subscriber is 158. Shortly after springs 60 and 61 have again short circuited springs 66 and 67, disk 30 upon rotating a little farther disengages itself from brush 59 thereby again removing the short circuit from around receiver R and transmitter T. The disk 30 continues to rotate until it has completedits revolution, but without effect other thanE 1Ltio e impulse caml 39 also continues to rotate until arm or bar 56, common to finger stops 11 and 11', restores to normal:

The calling device here shown and described illustrates the invention as used in a three digit system, but to use the same for] a seven digit system merely requires the substitution of appropriate disks 30 in which case up to seven cam surfaces such as 113, 114, etc., would be distributed about the periphery'of disk 30.

Having fully described and ascertained the various features of the invention, what is considered new and desired to have protected by Letters Patent will be pointed out in the appended claims.

yWhat is claimed is:

l. In an impulse transmitting device', impulse springs, means for operating said springs a definite number of times each time the device is fully operated and restored to normal, means for short circuiting said springs, a plurality of means for removing said short circuit at different periods during the operation of said device, and meansfor determining which of said last means will be used.

2. In an impulse transmitting device, a pair of impulse springs, a power spring for operating said impulse springs, a plurality of cam surfaced disks each individual to a particular designation on said device, a pair of springs normally short circuiting said impulse springs, manually operated means for causing the elevation of said short circuiting means opposite a disk corresponding its designation on said device, manuallyvoperated means operated' incidental to the operation of said first manually operated means for storing power in said power spring to effect the operation of said impulse springs and said disks. y

3. lin an impulse sendingdevice of the dial type, means responsive to a single selective operation and release of the dial for causing the device to immediately transmit definite and uniformly7 spaced series of impulses ir-' respective of the number of impulses in the respective series, and means responsive rto another single selective operation of the dial for causing a like spaced different definite series of impulses to be transmitted.

4. In an impulse sending device, manually operable means for' preparing said device to transmit aseries of impulses, and manually operable means for reventing the transmission of certain of said impulses so that those transmitted occur in groups in accordance with the distance of operation of said last means, said device so arran ed that the operation o the first means is incidental to the operation of the last means.

5. In combination with an impulse transmitting device, a casing, screws at points in the outer periphery of the device registering with holes in said casing, said holes being slightly smaller than the largest portion of 'the heads ofv said screws permitting said screws to -be turned outward to lock said device in said casing. v

6. In an impulse transmitting deviceof the finger hole dial type, a plurality of diametrically disposed movable finger stops, said devlce operative responsive to a single operation thereof to transmit an impulse code comprising series of impulses, and means for causing the code transmitted to be jointly dependent on the finger hole and linger stop used.

7. In a code impulse sending device, a plurality of code determining elements, an element selecting means, means responsive to a single actuation of the device to cause said element selecting means to be positionedopposite a desired element, and means thereafter effective to rotate the element selected to eect the transmission of a desired code.

8. in an impulse sending device, a single diall and cooperating means for sending different codes o impulses by dierent operations of said dial, each operation transmitvting a plurality of groups of impulses, said ian i meansfor operating the device to cause a means operated by the dial to select a disk,

the disk selected being dependent .on the extent of movement of the dial.

11. In an impulse transmitting device, a

i dial having a plurality of enger holes, a

plurality of disks, there being a disk for each hole on the dial, and means operated by the dial effective to select the disk individual to the finlgler hole used in operating the dial.

12.- an impulse transmitting device for transmitting a pluralit of'impulse series each vtime it is operate a pair of impulse springs, a cam `for operating said springs a definite number of times each time the device is operated, a plurality of disks, and a single pair of contact springs having access 'to any one of said disks and cooperative with any disk with which it is associated to determine what operations of the be effective. v

13. In an impulse transmitting device, a plurality of cam' surfaced disks each individual to a particular designation on said device, a fin er hole dial, means operated by said dial or causing the selection of any dlsk, impulse springs, means for operating sai-d impulse springs a definite and invariable number of times irrespective of the disk selected and means cooperating with the selccted disk for causing certain operations of said impulse springs to be ineffective.

14. In an impulse transmitter, a pair ofv .normally closedimpulse springs, a pair of normally closed shunt 4springs connected in multiple with said impulse springs, means for operating said impulse springs a definite v number of times each time the transmitter ,be effective.

15. In an impulse transmitting device of the dial type, impulse springs, means responimpulse springs will v sive to asingle selectivev operation of the dial for causmg `the impulse'springs to be operated a definite number of times irrespective of the digit transmittedand means automatically efective periodically for causing the impulse springs to transmit impulses.

16. In an impulse transmittingA device, im-

pulse springs, fa finger hole dial,`a lurality causing the operation of the impulse springs,

other means operated bythe stop preventing any movement of the dial after the stop has moved a definite distance and until the stop' has been restored to its initial position, and means operated by the stop in a manner -dependent on the disk selected for causing series of impulses to be transmitted before the dial is allowed to restore.

17. In an impulse transmitting device, an impulse transmitter having two pairs of normally closed contacts connected in multiple, automatic means for causing said pairs of contactsto be subsequently operated A:for intervals, the one pair of contacts transmitting a plurality of series of impulses, the number of impulses in each series being dependent on the intervals during which the other pair l is operated.

18. In. an impulse transmitting device,

means for transmitting an excessive number of impulses responsive to a slnglesact'uation thereof and means for preventing certain selected series of said impulses from becoming effective. A v

19. Inl an impulse transmitter, a control circuit, a. first and a second setof contacts, means for selectively varying the location of said first set of contacts, means for then operating both sets of contacts, and means variably infiuenced by said first contact set in a manner dependent on its locationl for also varying the efectsproduced by the operation of the second contact set.

In witness whereof, I hereunto subscribe my name this 3d day of June, A. D., 1924,

JOHN G. BLnssING. 

